问题
I've got this error and get stuck.
I tried to remove .babelrc file but this doesn't make it work.
回答1:
You need to import babel-polyfill as a first thing in your script:
import 'babel-polyfill';
回答2:
I had this exact same issue, but I fixed it by adding transform-async-to-generator to my .babelrc file from this babel package babel-plugin-transform-async-to-generator
来源：https://stackoverflow.com/questions/44237944/undefined-is-not-a-function-evaluating-babelhelpers-asynctogenerator-react-n